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Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings | $ (772,283) |  |  | $ (946,236)
Revenues | 885,288 | $ 855,933 |  |
Net periodic benefit cost | 237 |  |  |
ASU 2014-09 | Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings | 11,136 |  | $ 1,400 |
Revenues | $ 6,633 |  |  |
ASU 2016-16 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  | $ 3,700 |
ASU 2016-18 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Change in restricted cash for operating activities |  | 3,432 |  |
Change in restricted cash and investments |  | $ 1,114 |  |

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